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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dac6a3c3bfed2a3f901cc5db2fa9e2ec5c81309517d38e6f367c0a055be8af8' 
  AND token = 'ScLaP8/GJcO0KBsm2vIlBwn0chagrBZeAt77AvpRZs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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