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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00c82457c7a7fdff5af0ae1f152a179d89216f5a5c225395817c25818c4b81a9' 
  AND token = 'FmxaOfd+lnOThPBggIbkOSAFWYvvvWvTxVRfaO5Aiks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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