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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad3ae5c49f2f3f9571e86bf4da58b0200b726fbd894f009e99039ba39d801498' 
  AND token = 'l0hr/qBluuH4O51+kNXmzsDddP6X/rp0SYfTj3Xjmkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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