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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ddc3418c5ce1d7996084643f4548c5f2d1ac43e2e334782c1f5b9fedf946f8f9' 
  AND token = 'tVy7MAhCXuRTFoonEoQhDlkhqWYL3fHi02lA2bryobw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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