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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99f9c83fe3574d6a6febc25b867ca1e0b977e4e7cfc0c2f66adb90cc07af891c' 
  AND token = 'Eb3qePevbsw9gvBE1idWLEbSRvfR5xTp5is0LzivUlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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