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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f49f6d9c618335aba0b8f45cddb68da28b838bb26cd5ce76989d4bf3e5e6cb2a' 
  AND token = '9uwP05NnAJOcMVN8n3ZcI5Pz4DvxBiwFElQLomukuiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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