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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b96a569227b03ac6ffb1926b8f2c50dafd0b72f783860e8bded97ee2a88b0739' 
  AND token = '130myQ3OOe903bepryH0VumgLHw/MQCpEN7/0MIc+3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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