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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a638697b7e70bd61814cc398f7886be7ef133e1055c5a657dfabc5961585213a' 
  AND token = '/LvqWce3XRSk0x7B3Qdbjd/nB9rb3oPBEIbr+2rTCXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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