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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d10fe9a4ec2d5b98a1745ed8fa0b7e7d504879f81ba8e863ba0c33e4d407f7b' 
  AND token = '6XUqI9M8M7paZveTTpG/PsMFOjcN7u1rGlDGCNMeEfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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