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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bca531ed19d2f8758b498d4b24ddafa01c8cb7695166f3ccdefa5a4874e1757d' 
  AND token = 'S+JkQeQdt927vHeEYHKqIgf7OyIiU8dFUacz8V/lVvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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