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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10d93acaab5e5a027541462fde2de07e671f88bdb88dd18fcf062d61255ec27a' 
  AND token = '/w6C7wk60k4dR2vsFX6x4QbiSY3GuXgzJ96OapSCzjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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