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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eeb7687466a9eb1fa6663468e62b89fcafad1e52c6e4f2a5ae3b70ee83bc913e' 
  AND token = '758epvgYKAkBnwzlIMvzz4Vr8xGOH+VFnkxflMOTn4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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