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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5bcc3833b174c614cca2a1ded846b2d158159a9cdac96af9b862235c2819679' 
  AND token = 'Y6eDVBfBSeujoRVsxE+97oN4NTalm7SXc7RDro5ToUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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