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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'abbcc67e25e011615e06f385735e5ca9734b3544748264db97ec2f4c710c0e90' 
  AND token = 'yb2NjgK95IVhujRaURyjW3PGQ1hvM5vWf9mhs2jWeiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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