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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '724f0ced43e513d20d1de020fb9455d22e17ec9aac9facab55f16947238f8220' 
  AND token = 'he3KnygSPwVDHQ8t3n0rcTWgIA0IlFbZDxxtsYEtDk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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