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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5afe4bcc3c2d77bcda325f1e208c666c1bcfbd4872d732b392b86d06c45602bf' 
  AND token = '1z0dWU6/7eQBGOLR52j0yjLLRvdOcls7Tku1ngKHMCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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