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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1dfa883bcd3b1ddd18afb172df911ac05cf5440b0cb36a9db727834cc8b83dd2' 
  AND token = 'lNG/wJ7+7Nwyup5xr7W5Ccmaq+wRwEW7BMRY+7Seq74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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