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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7627e0838a3b3e67026b7e30161029c11b522d3a2cc0787ed41eb190ce7f85f4' 
  AND token = '1Ylbh5vkMD1uA6VNFDdCoyjYJMXIqlNLt9MmwENTd2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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