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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a16f0bf51cc5928ffd97e22d41d7a175e1edef9e24025cd66a87e801b2bb9e3' 
  AND token = 'CavTV2hfP0o60sxhzEVN+ioIkcLoDS0+IS96rQGEEBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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