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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c99d2a0f1408aa797dfbd199df3c0d61f8ee5227c8ae989e43f1e493b1e8ec5c' 
  AND token = 'ziIyYVBL+5U0XgS2I1djPm72xlVR5gCF+1TnUAVYyfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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