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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fac4892baceb598ede3ed9eefbde562059f04bfb56a6075b4cc6481ab43d279' 
  AND token = '8M0Lx+vH0+4FBClI6bLjqPFYlEIzFt4Qhbi84QFECuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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