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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10d13f2ab1cf735b3b279d8874bdd0ba7e08b3c3edcbac899871e15176c14e50' 
  AND token = 'qR9gLpuEJGadSTzlza3BLRaA2mQzclTDqB2S79kS5MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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