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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fce01f96e8dc5e0f24ca7141c077ecf21602c38e7308f28ae34cbd703b2ca323' 
  AND token = '1Po6sPehbZCMPWVA1pKIJD9HwRZ5rjE3GX6xsi59h1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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