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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7acb8aa7e51ae5bb1d0caffaeb20d17bfc56d8175d2026201f5c761e4621e9c' 
  AND token = 'Q3R3N3oe0HF9zAEcUibuRn6z7MHH+12tUCwWXp41lXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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