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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd23f72e4746ef2078b651a4b47f6d634ffb4ffe48518eb4de5061b6fad453b86' 
  AND token = 'bF+4DHWlfU+TniDFRZNwutL91qmefXL8+pM5TOOByEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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