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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '90707045d077ffbbf819457b1bef83c2ef883d19c448f84ed9fa8b2cb29faaac' 
  AND token = 'DXs97+T/41x1Gw9NcdjZ/mi+fUrLvH7rD0NoPYc88bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}