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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e70bd41b07bf74f38de70a79d121ad989002ce9eac5d83a8c3ce3bfca35e692' 
  AND token = 'nTyZtUlXZcMp0vejVI3fCT2zTRodZDDXmlAIv9M3DEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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