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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a960f7c8c0a13a3ed1297f9f59fac47331b7e1f6a4551e71ad304fc8ff274eef' 
  AND token = '8qRKj2Ja2rkmuu3SXh0WHKRsFeWC1FdNt/QiAmDg1T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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