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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b8b2b660a013c37a1d4ed0d7f204390cbb913cbcb379d4c61158cd727c8172b' 
  AND token = 'cJmZoblsj/AmyR1TKALInRG0Prg4x8P0g2UkShFdDXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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