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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e054ad70520a0ef49b055fd922a49dcc245ee357742e7b3fed748f6a4943e072' 
  AND token = 'yLUNqxZJ2Lca1YdjiY0FPogIk15cktjK8SjIk9d5ixc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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