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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2dcc27a673a076d4d98e93ba57ca757623a73a7cb7c1ac8e2f7aad351c5111fc' 
  AND token = 'N+40cDS5iYGmrMElgOhp+rSTfSby7/FJzGC3KTTP6Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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