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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95c43e0c178fd5b3cc68b460ef8eebc03f571d554134bf2016ebebaa9dbaee6a' 
  AND token = 'lddA2xaZlmDrQCok8VN97iOkjpi+mFHvIFH1L71o5xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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