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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fc143916fedef2fbac0bf09d8e89cb8ded20400b07de15a37847928bc10cc97' 
  AND token = 'iO/o2Qvf51OwbBA+5Q/NxW8xgppRagzAbT8yBJWZvNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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