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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56fa85e17b5a02aa2156e2903cc295008ba0fe5be6b2e6f7e090d3bfb88ec715' 
  AND token = '5xcoxinPMHugoNStfjns0aC/06Uki+tRs0M0o7u9Lbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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