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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef1564d85251b7b4c4e82c1f21c3ebefb7164180c706b941dbf7842862c1370f' 
  AND token = 'kBWsGYUNqUtF6aaXEMukdRrRiqQ935L4PMRT7p7JzYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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