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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db9c3f5edc9f360f1a7ec55c5ed00cf90df7804d84c26a908f54cc0e2b7e93a3' 
  AND token = 'ecp8CgtsKOD0+Gd9Q/Sj+hYA0T4AbNtR/X43kWH185k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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