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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24941987a58f9c9f576765f6fbe1e6845d2e8c82416e9116897510dc32cb459e' 
  AND token = 'RbEOZ2ZpmKex672hibLfUHkZ692IysfBeUEzCJndNls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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