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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39545d1666ed6d2aade5f7270f98e2656ef7297a185b65a45cd8b62bfcd052f4' 
  AND token = 'UiwPFD7g+TMCJ4MG6SV8uLg+Yvmfp+q5SeAkbPdNZ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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