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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e6facee08da87adc87e0c8ddfcc6ce3e038533d66072f386ab8fa27d2c33252a' 
  AND token = 'pdw7G9p5qkQh9NGiO5793QL179vthFwOgB3smVwEuHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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