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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '706b33b08e728042d4726f8c8cee1f6bb1d40f4bebd257b16d05bd56e5073582' 
  AND token = 'tsUH9YyaCAZjnon3N7HofVZ5eG5Jzvy0NQNVcxFX8aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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