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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2624cf08d481aad3610ef4c2d27c7f3b1baf3996c38e480df01bf8c4eb194cf2' 
  AND token = 'o2Tv+iTejI463PgLebt6464vKIL6ceKLwavi71Gev0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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