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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea079bd7fe356e62c756706bc751c2c598be1c4f69b7cb1cc4794a94eafc76e4' 
  AND token = 'JST2GQoGqhxlLljqPUvdDwrbsLd3ncI4flSuPYqcseY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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