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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1354fdf249b38d9266889dd513d38e4544183228ed26fe35b70e673173a3f18e' 
  AND token = 'nYn47/1p2Zcl50SWCKmQENRIOC0BJZman7Mpua4oqUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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