SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3046f4825db9e81cdc63fdd26da1559def78c9fffb51d5182f957467f916cf2a' 
  AND token = 'gkqh0vIse730r3InQ8NXTlmYLZJmiyHmGTBDoU/qxlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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