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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9ac3e6834fb859aba9d4ee3f46d02e14ddf3db79173bdb40a1a84e8429b36cc' 
  AND token = 'y+DVmtx5s/cdzmnMBFcv6M4a0rdENcAU2M06K5ubqx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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