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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f2270421003dc7e418fac3ad2cf6284f6cc2d0fe09938c984bbe29432f1cda4' 
  AND token = 'GLw41x3Vc7VXykyIJ691AVkVv3ak1B8F+3tlPHjNeMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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