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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32f83bbe3bfe130d4f800f360f92a36d8b0ebf46ced3d1620a21fa137f838126' 
  AND token = '+45o8akkOrY87GuQmpAL53y5jvWezK3mxHTJ17tbLVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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