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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9dc86db3a8f48707d1bf47c1288989ae433a4bdb7f0da84fc7895c9656aa2d4d' 
  AND token = 'CbAXsYT3r567W0M89UepZqauh77P66FXeGkHB+wQ4YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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