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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c704e0b511e20c44d859ad525789cc3b3ba69bfe5af9988940a423443812e5fe' 
  AND token = 'RkeCaQRfZ1rXSNcfx/8xkApoLzJEvIbQdlGA/GRpE2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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