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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72bfd8cd5afc261e8ab414fb19c9b0d85355ddee90c13f0fd67eef3a9540800b' 
  AND token = 'QM/gsUiJslW4x+Qdq0NZAQ/0OgtiIySMc7T0xOUpYTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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