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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17f8be1bd28de80eeb6dacf6665311643961ce1bb8d1a2fc055b73a0ed5269a4' 
  AND token = 'xuQT56QALkF3DGyIIt/kHLFIi/vb/aVFzmd0cpZSpOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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