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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a703172d837e1f045a9f8148051112dc194094dac9fd60323c3379b79ba7994' 
  AND token = '2+QdTzA4zIbZv7/3gMHCHgZHRTZ9EVPK7BpDaPeeiPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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