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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '17f180594c0f6a9b91932c4e68390f3f6682853434b2f7a3e3e5ba909ba7ce7d' 
  AND token = 'b1NjHW6VLqMXBcfLGLV3mub0j1j8E6ME953wxUzm79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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