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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '536d7ab3d8b3a13780c99a14811e93a1a956ae4dcef0e31d5a8ac4b6e604c818' 
  AND token = 'hDKiR0wDaYfn0wzmRzOdC1ER0V5ryp6mxdHaJ06kEzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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