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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f89c043ff847e660148d1a6773b67bc0df0a0c7170711da8c38c5edc8b0b5bd' 
  AND token = 'a1aTjF+Dov3yfBbJjJuaC3dmfg4KA5MUWZ0XXaAwjDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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