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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '15807eb532a984b53a5e55175128fe615450146efd448b4d8775b7d1250eb2ed' 
  AND token = 'PyVPoGTrrHZQstYuDhhMi51QbfbafS771/8wKxUOZW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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