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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '831366dcd4d11072b8259609220c2c4b0b19064de23d3e9b9adcaf75bf6e5673' 
  AND token = 'nsX7EKLgp5SSk1Gir+b6p0NHHT+DjVJ9ggfpwbSMkI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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