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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f6f08491358d9c09d49fe71edc7994deee7dce84fd559e4c899c2ca1c379ddd' 
  AND token = 'JWAlOoWc088efLqnZPsJyti2qZ9tZtl3vJiU+BdtXxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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