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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b9ad8daabdd94bdd2c3589c895a9cf082034c2030eae1c09c196b6e263cb462' 
  AND token = 'vVLvrisp/Ck/BZiA2vETE67XgHaDafvE42Nauzp7YlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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