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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5af7f5a2d18820f0433c75ce9493c627abdfa617fb6f160f1dee1a77344705ca' 
  AND token = 'pGlOlJSDEpkMfzfrB+uxp/BTP3dV/kAi8x0bSX0Btgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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