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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '66841a277c7d8f7061000de950b3eba6bb679627d3991a55a131779dbad6f10b' 
  AND token = 'GLDG6NSzhqumaUuDJrUqModOnKae+HknYfdlivM4kuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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