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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '31e0427f464cf2e4e8f08dc06328635beec1a9b4d950756cf7647b08804c7468' 
  AND token = 'WAOpQ0bsBCZoF/XcOEjSubv/i4xu/si9xa0j8S5eSMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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