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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08af4d018ce3d2648cc4f561cc12d447b39fde5691a3f0d61e03c3fa117bb3a3' 
  AND token = '6ok2P5ZnQpq3eCyhp68j3HveBf2EjGHKPCc3FBjcDx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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