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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '203c7c8055e9ec590c3daa4a9c67b1dcba19e4c5c2f052ac7d8ca2ab390b57ca' 
  AND token = '4btzPNXHzXaTubB6KuHopnRmSKR2gtQNE0UdUSQVOtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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