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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f89e46f3226dd0ba01df5605e30df14e1e2e961c1fc05cf316ad72e91c466f76' 
  AND token = '5KXoOOmj5s4kwwaBXS6j+Mvg0rtJEb20SSHSFGWF46Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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