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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5e6e5785cc8753f03853f30ddba25d3e1352a9500a678fb5c0c2834e3c494159' 
  AND token = 'FEUHgbfQ9AM9faIsa0jRfl1bJMp34ZQW236ggULkx2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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